My son got this in his change. I really don't know anything about Paper, so if you all can help out here. The paper feels waxy really odd. Plus, you can read nearly all the details of the opposite side. And this one showing the color.
Looks like it has been soak in oil or similar liquid. PMD. Try putting it in acetone for a day or so.
In a bikini at the beach Smells like hot Cocoa Butter. As made famous in the Original Robocop film: "I'll buy that for a dollar".
I don't know about putting it acetone, as it could eat the note. I really don't think that there is anything special to the notes and wouldn't do anything to them, except spend them.